Local exhaust apparatus

ABSTRACT

A local exhaust system includes a motor provided in an exhaust pipe to generate a rotary drive force when power is applied thereto, in which air is taken in through an intake port and exhausted through the exhaust pipe, a rotor structure disposed on the leading end of the intake port and connected to a drive shaft of the motor, the rotor structure rotating about a central portion of the exhaust pipe, and a plurality of turbulence-generating outer blades for generating a turbulent flow when rotated. Each of the turbulence-generating outer blades is assembled to the outer surface of the rotor structure via an angle-adjusting member in such a fashion that the angle of the turbulence-generating outer blade is adjustable with respect to the direction in which air is taken in through the intake port.

FIELD OF THE INVENTION

The present invention relates to a local exhaust system and, more particularly, to one in which the turbulent flow can be controlled simply by adjusting the angle of turbulence-generating blades, so that the strength and the range of the turbulent flow can be varied suitably according to certain conditions, under which pollution sources are produced, while both the turbulence-generating blades and intake-exhaust blades are being driven and rotated by one drive source.

BACKGROUND OF THE INVENTION

In general, a local exhaust system is a set of equipment that is installed inside a plant, a restaurant, or the like, which frequently produces pollutants. The local exhaust system serves to provide an intake-exhaust force to an inlet, which is one end of an exhaust pipe, thereby exhausting polluted air from indoors to the outside.

The local exhaust system can be effectively used in the case where a local pollution source is present in a bottom area that is remote from an intake port, which forcibly takes in pollutants in the air, in the case where it is difficult to install the intake port adjacent to a pollution source, or in the case where a pollution source is instantaneous.

However, the local exhaust system used in such cases has several problems. Since the efficiency of the local exhaust system in eliminating the pollution source decreases sharply in proportion to the distance from the intake port to the pollution source, it is required that the intake port of the local exhaust system be installed adjacent to the pollution source. However, this may disturb working processes and workers' movements and thus installation conditions are limited.

Accordingly, local exhaust systems in which the intake area is increased using a turbulent flow are disclosed in Korean Patent Nos. 10-0529002 (dated Nov. 9, 2005), 10-0784250 (dated Dec. 4, 2007), 10-0821295 (dated Apr. 3, 2008), 10-0873521 (dated Dec. 4, 2008), 10-0873522 (dated Dec. 4, 2008), and the like.

However, the local exhaust systems are configured to generate the turbulent flow by providing merely the fan-like blades outside the intake port at the end of an exhaust pipe. This configuration is not sufficient to realize an optimum efficiency under a variety of installation environments. In addition, in order to form an optimum turbulent flow under the variety of installation environments, it has been required to provide and install various types of turbulent-flow blades through repeated processes of trial and error.

In particular, it is impossible to adjust the size of the intake area, that is, the area in which indoor air, which is intended to be taken in and exhausted according to various conditions of installation environments, can be forcibly taken in. Therefore, there are limits to which the functionality of the local exhaust system can be diversified and the exhaust ability thereof can be enhanced.

In addition, the exhaust pipe is required to include a turbulence-generating motor, configured to drive and rotate turbulence-generating blades located adjacent to the intake port, and an exhaust motor, configured to drive and rotate an exhaust fan, which exhausts the indoor air to the outside by generating an intake-exhaust force inside the exhaust pipe. This acts as a factor that increases the total number of components of the local exhaust systems, thereby increasing manufacturing costs, and gradually increases power consumption per time, thereby burdening facilities with higher maintenance costs.

BRIEF SUMMARY OF THE INVENTION

The present invention has been made to solve the foregoing problems with the prior art, and therefore an object of the present invention is to provide a local exhaust system, in which a user can adjust the angle of turbulence-generating outer blades in order to suitably expand or shrink the actual intake area of polluted air within the possible intake limits of the site conditions under which the polluted air is intended to be exhausted to the outside.

Also provided is a local exhaust system, in which both turbulence-generating blades and intake-exhaust blades can be driven to rotate using one drive source. Thereby, it is possible to simplify the system structure, reduce manufacturing costs, and reduce power consumption by reducing the number of overall components.

The local exhaust system includes a motor provided in an exhaust pipe to generate a rotary drive force when power is applied thereto, in which air is taken in through an intake port and exhausted through the exhaust pipe; a rotor structure disposed on the leading end of the intake port and connected to a drive shaft of the motor, the rotor structure rotating about the central portion of the exhaust pipe; and a plurality of turbulence-generating outer blades for generating a turbulent flow when rotated. Each of the turbulence-generating outer blades is assembled to the outer surface of the rotor structure via an angle-adjusting member in such a fashion that the angle of the turbulence-generating outer blade is adjustable with respect to the direction in which air is taken in through the intake port.

Preferably, the local exhaust system may further include an intake-exhaust inner blade provided on the rotor structure to be located inside the rotor structure or on a rotary shaft to be located inside the exhaust pipe. The intake-exhaust inner blade may generate an intake-exhaust force inside the rotor structure or the exhaust pipe.

Preferably, the rotor structure may be configured as a hollow cylindrical member, with the inner and outer surfaces thereof being parallel with the direction in which air is taken in. The intake-exhaust inner blade may have a fixed end fixed to an outer circumference of the rotor structure and a free end bent from the fixed end, the free end extending a predetermined length such that it is introduced into intake port.

Preferably, the intake-exhaust inner blade may have a fixed end fixed to the outer circumference of the rotor structure, which is arranged inside the exhaust pipe, and a free end bent from the fixed end, the free end extending a predetermined length toward the exhaust pipe.

Preferably, a plurality of the turbulence-generating outer blades may be provided on the outer circumference of the rotor structure configured as a hollow cylindrical member, with the inner and outer surfaces thereof being parallel with the direction in which air is taken in, or on the lower surface of the rotor structure configured as a hollow disc member, with the lower and upper surfaces thereof being perpendicular to the direction in which air is taken in.

Preferably, the angle-adjusting member may include an erected member extending perpendicularly from the outer surface of the rotor structure and fitted into a coupling hole, which penetrates the central portion of each body of the turbulence-generating outer blades, and a fixing member assembled to one end of the erected member to fix each turbulence-generating outer blades in position, with the angle of the turbulence-generating outer blade adjusted about the erected member. The fixing member may be closely fixed to the turbulence-generating outer blade.

More preferably, the erected member may have a plurality of ribs, which protrude from the outer surface of a body of the erected member and extend in the lengthwise direction of the erected member, such that the ribs conform to and are coupled with a plurality of coupling grooves of the coupling hole. The coupling grooves may be recessed into the inner surface and extend in the lengthwise direction of the coupling hole.

More preferably, the erected member may have a plurality of ribs, which protrudes from the outer surface of a portion of a body of the erected member and extends in the lengthwise direction of the erected member, such that the ribs conform to and are coupled with a plurality of coupling grooves of the coupling hole. The coupling grooves are formed in the outer end portion of the coupling hole. The outer surface of the remaining portion of the body of the erected member may have a circular cross section such that the remaining portion of the body of the erected member is insertable into the inner surface of the inner end portion of the coupling hole.

In addition, the local exhaust system includes a motor provided in an exhaust pipe to generate a rotary drive force when power is applied thereto, in which air is taken in through an intake port and exhausted through the exhaust pipe; a rotor structure disposed on the leading end of the intake port and connected to a drive shaft of the motor, the rotor structure rotating about the central portion of the exhaust pipe; a plurality of turbulence-generating outer blades provided on the outer surface of the rotor structure at predetermined intervals, the turbulence-generating outer blades generating a turbulent flow in the lower portion of the rotor structure while being rotated in a predetermined direction under a driving force from the motor; and an intake-exhaust inner blade provided on a rotary shaft of the motor or inside the rotor structure, such that intake-exhaust inner blade generates an intake-exhaust force inside the exhaust pipe while being rotated in a predetermined direction under a driving force from the motor.

Preferably, the rotor structure may be a hollow cylindrical member, with the inner and outer surfaces thereof being parallel with the direction in which air is taken in. The intake-exhaust inner blade may have a fixed end fixed to the outer circumference of the rotor structure and a free end bent from the fixed end. The fixed end may extend a predetermined length such that it is introduced into intake port.

Preferably, the intake-exhaust inner blade has a fixed end fixed to the outer circumference of the rotor structure, which is arranged inside the exhaust pipe, and a free end bent from the fixed end and extending a predetermined length toward the exhaust pipe.

Preferably, the turbulence-generating outer blades may be assembled to the outer circumference of the rotor structure via an angle-adjusting member, such that the angle of each turbulence-generating outer blade is adjustable, or fixedly positioned on the outer circumference of the rotor structure. The rotor structure may be configured as a hollow cylindrical member, with inner and outer surfaces thereof being parallel with the direction in which air is taken in.

Preferably, the turbulence-generating outer blades may be assembled to the outer circumference of the rotor structure via an angle-adjusting member, such that the angle of each turbulence-generating outer blade is adjustable, or fixedly positioned on the outer circumference of the rotor structure. The rotor structure may be configured as a hollow disc member, with inner and outer surfaces thereof being perpendicular to the direction in which air is taken in.

More preferably, the angle-adjusting member may include an erected member extending perpendicularly from the outer surface of the rotor structure and fitted into a coupling hole, which penetrates the central portion of each body of the turbulence-generating outer blades, and a fixing member assembled to one end of the erected member to fix each turbulence-generating outer blade in position, with the angle of the each turbulence-generating outer blade adjusted about the erected member. The fixing member may be closely fixed to the each turbulence-generating outer blade.

More preferably, the erected member may have a plurality of ribs, which protrudes from the outer surface of a body of the erected member and extends in the lengthwise direction of the erected member, such that the ribs conform to and are coupled with a plurality of coupling grooves of the coupling hole. The coupling grooves may be recessed into the inner surface of the coupling hole and extend in the lengthwise direction of the coupling hole.

More preferably, the erected member may have a plurality of ribs, which protrudes from the outer surface of a portion of a body of the erected member and extends in the lengthwise direction of the erected member, such that the ribs conform to and are coupled with a plurality of coupling grooves of the coupling hole. The coupling grooves are formed in the outer end portion of the coupling hole. The outer surface of the remaining portion of the body of the erected member may have a circular cross section such that the remaining portion of the body of the erected member is insertable into the inner surface of the inner end portion of the coupling hole.

As set forth above, a plurality of the turbulence-generating outer blades is provided on the outer surface of the rotor structure, which is forcibly rotated in one direction by the motor, such that the angle of the turbulence-generating outer blades is adjustable in relative to the direction, in which the air is taken in, via the angle-adjusting members. Accordingly, the user can easily and correctly adjust the angle of the turbulence-generating outer blades, which generate a turbulent flow to act as an air curtain when the rotor structure is rotated. The position and range of the turbulent flow, which is generated directly below and around the outer blades, can be suitably varied according to certain conditions, under which pollution sources are produced. Thereby, it is possible to verify the functionality of the system and enhance the intake-exhaust performance of the system while adjusting the range of the intake of air.

In addition, the intake-exhaust inner blades, which rotate together with the turbulence-generating outer blades, are provided inside the rotor structure or the exhaust pipe. Due to the intake-exhaust inner blades, which rotate together with the outer blades within the intake range formed by the turbulent flow, which is generated by the rotation of the turbulence-generating outer blades, it is possible to provide an intake-exhaust force to forcibly take in air, which includes pollutants, and exhaust the air through the exhaust pipe. It is not necessary to provide a separate intake-exhaust drive source, which generates an intake-exhaust force in the exhaust pipe, and the two functions can be performed using one drive source. Thereby, it is possible to simplify the overall structure and reduce manufacturing costs by reducing the number of components of the system and improve price competitiveness by reducing power consumption.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a configuration view showing a local exhaust system capable of controlling a turbulent flow according to a first exemplary embodiment of the invention;

FIG. 2 (a) is a front elevation view taken in the direction of arrow A in FIG. 1;

FIG. 2 (b) is a front elevation view taken in the direction of arrow B in FIG. 1;

FIG. 3 is an exploded perspective view showing the local exhaust system capable of controlling a turbulent flow according to the first exemplary embodiment of the invention;

FIGS. 4 (a), (b), and (c) is an exploded perspective view showing an angle-adjusting member of the local exhaust system capable of controlling a turbulent flow according to the first exemplary embodiment of the invention;

FIG. 5 is a top plan view showing a rotor structure of the local exhaust system capable of controlling a turbulent flow according to the first exemplary embodiment of the invention;

FIGS. 6 and 7 are configuration views showing a local exhaust system capable of controlling a turbulent flow according to a second exemplary embodiment of the invention; and

FIGS. 8 and 9 are configuration views showing a local exhaust system capable of controlling a turbulent flow according to a third exemplary embodiment of the invention.

DETAIL DESCRIPTION

Reference will now be made in detail to various embodiments of the present invention, examples of which are illustrated in the accompanying drawings and described below.

FIG. 1 is a configuration view showing a local exhaust system capable of controlling a turbulent flow according to a first exemplary embodiment of the invention, FIG. 2 (a) is a front elevation view taken in the direction of arrow A in FIG. 1, FIG. 2 (b) is a front elevation view taken in the direction of arrow B in FIG. 1, and FIG. 3 is an exploded perspective view showing the local exhaust system capable of controlling a turbulent flow according to the first exemplary embodiment of the invention.

As shown in FIGS. 1 to 3, the local exhaust system 100 according to the first exemplary embodiment of the invention includes an exhaust pipe 101, a motor 109, a rotor structure 110, and turbulence-generating outer blades 130.

The exhaust pipe 101 can be configured as a hollow cylindrical tubular member having a certain length. The exhaust pipe 101 serves to forcibly take in polluted air, which contains pollutants, through an intake port 102 from an indoor space, guide the forcibly-taken polluted air to an exhaust port opposite the intake port 102, and exhaust the polluted air to the outside through the exhaust port.

The motor 109 is disposed in the center of the exhaust pipe 101 and is connected to the rotor structure 110, which is disposed in the leading end of the intake port 102 of the exhaust pipe 101, such that the motor 109 can forcibly rotate the rotor structure 110 in one direction.

The drive shaft 109 a of the motor 109 can be integrally connected to a rotary shaft 112, which serves as the center of rotation of the rotor structure 110. As an alternative, the drive shaft 109 a can be assembled to the rotary shaft 112 via a coupling 112 a such that it can be replaced. The rotary shaft 112 is coaxially disposed with the center of the exhaust pipe 101.

The motor 109 generates a rotary drive force when power is applied thereto, and can be fixedly installed using a plurality of inner support members 111 so that it is disposed in the center of the exhaust pipe 101. The inner support members 111 extend from the inner surface of the rotor structure 110.

Here, the inner support members 111 can be configured as thin plates or rods in order to minimize the friction resistance of fluid that is forced into the exhaust pipe 101. Although the inner support members 111 are provided integrally with the body of the motor 109, this is not intended to be limiting. Rather, the inner support members can be assembled to the motor in a replaceable fashion in order to facilitate the repair or substitution of the motor 109 when it is broken.

The rotor structure 110 has been shown and described as being disposed at a certain interval from the leading end of the intake port 102 of the exhaust pipe 101 such that it can rotate in one direction about the center of the exhaust pipe 101, to which an intake-exhaust force is applied, and as being configured as a hollow cylindrical member, with the inner and outer surfaces being parallel with the intake direction P. However, this is not intended to be limiting. Rather, the rotor structure 110 can be configured as a hollow disc member, with upper and lower surfaces thereof crossing the intake direction at right angles.

The rotor structure 110 is fitted to the leading end of the rotary shaft 112 that extends from or is detachably assembled to the drive shaft of the motor 109, which is disposed in the inner center of the exhaust pipe 101. The leading end of the rotary shaft 112 is connected to a plurality of outer support members 113 that extends radially from the inner surface of the rotor structure 110.

Here, if the length of the rotary shaft 112 connecting the rotor structure 110 to the motor 109 is increased, the rotary shaft 112 can be rotatably supported at an intermediate portion of the length thereof via a bearing, which is provided on a shaft support member (not shown) extending radially from the inner surface of the exhaust pipe 101, in order to prevent vibration during driving and rotation.

In this case, although the leading end of the rotary shaft 112 can be provided integrally with the outer support members 113, this is not intended to be limiting. Rather, it is preferred that the leading end of the rotary shaft 112 be detachably fitted (i.e., assembled) into a coupling hole 113 a, which is formed in the place where the outer support members 113 meet together.

In addition, although the rotor structure 110 has been shown and described as having substantially the same size as the outer diameter of the exhaust pipe 101, this is not intended to be limiting. Rather, the outer diameter of the rotor structure can be set smaller or larger than that of the exhaust pipe.

The turbulence-generating outer blades 130 are multiple plate-like wing members that are installed on the outer surface of the rotor structure 110, along the circumference thereof at regular intervals. When the motor is driven, the turbulence-generating outer blades 130 can generate a turbulent flow in the form of a doughnut in the vicinity of the lower portion of the exhaust pipe 101 while rotating along with the rotor structure 110, thereby applying an intake-exhaust force into the exhaust pipe 101 as well as more efficiently taking polluted air into the exhaust pipe 101.

The turbulence-generating outer blades 130 can be attached to the outer surface of the rotor structure 110 via angle-adjusting members 135 such that the angles of the outer blades 130 can be adjusted relative to the intake direction P in which air is taken in through the intake port.

As shown in FIG. 4 (a), the angle-adjusting members 135 can include an erected member 135 a and a fixing member 135 c. The erected member 135 a perpendicularly extends a certain height from the outer surface of the rotor structure 110 and is fitted into a coupling hole 135 b, which penetrates the central portion of a turbulence-generating outer blade 130. The fixing member 135 c is fastened into a fastening hole formed in the distal end of the erected member 135 a and is closely fixed to the turbulence-generating outer blade 130 in order to fix the turbulence-generating outer blade 130 in position, with the angle of the turbulence-generating outer blade 130 being adjusted about the erected member 135 a.

As shown in FIG. 4 (b), the erected member 135 a can have a plurality of ribs 135 d, which protrudes from the outer surface and extends in the lengthwise direction of the erected member 135 a. The ribs 135 d conform to and are coupled with coupling grooves 135 e, which are formed in the inner surface and extend in the lengthwise direction of the coupling hole 135 b.

In addition, as shown in FIG. 4 (c), the erected member 135 a can have a plurality of ribs 135 d, which protrudes from the outer surface of the proximal portion and partially extends in the lengthwise direction of the erected member 135 a. The ribs 135 d conform to and are coupled with the coupling grooves 135 e, which are formed in the inner surface of the outer end portion of the coupling hole 135 b. The erected member 135 a also has a circular-cross section portion formed on the outer surface of the distal portion thereof. The circular cross section portion can be inserted without interruption into the proximal portion of the coupling hole 135 b.

Here, a plurality of the turbulence-generating outer blades 130 is rotation-adjusted at a certain angle in the clockwise or counterclockwise direction about the erected member 135 a, with the angle thereof adjusted relative to the air intake direction P by the fixing members 135 c, and then securely fixed in that position, such that the turbulence-generating outer blades 130 can vary the size of a turbulent flow that is generated directly below the outer blades 130 when the rotor structure 110 is rotating. In addition, it is preferred that the turbulence-generating outer blades 130, provided in the rotor structure 110, be adjusted to have the same angle of rotation.

That is, the turbulence-generating outer blades 130 are assembled to the outer surface of the rotor structure 110, such that the angle of installation thereof can be adjusted. Here, it is preferred that the turbulence-generating outer blades 130 be disposed such that they protrude at a certain length toward the intake side (i.e., the lower portion in the figure) rather than to the end side of the rotor structure 110 in order to increase the generation of the turbulent flow through frictional resistance with the air around the intake port 102.

In addition, although the turbulence-generating outer blades 130 have been shown and described as a plate having a linear cross section, this is not intended to be limiting. The turbulence-generating outer blades 130 may be provided in the form of blades that have a curved cross-sectional shape.

In addition, although the outer surface of the rotor structure 110 on which the turbulence-generating outer blades 130 are disposed has been shown and described as being configured as the outer circumferential surface like the inner circumferential surface on which intake-exhaust inner blades 150 (to be described later) are fixedly disposed, this is not intended to be limiting. As shown in FIG. 5, a plurality of planar arrangement surfaces 119 can be provided on the outer surface of the rotor structure 110 such that, when the angle of the turbulence-generating outer blades 130 is adjusted, the lower end of the body of each blade is always in surface-to-surface contact with the outer surface of the rotor structure 110. The number of the arrangement surfaces 119 can be the same as or relatively greater than the number of the outer blades 130.

Unlike the turbulence-generating outer blades 130, which are provided on the leading end of the inlet, outside of the exhaust pipe, to generate a turbulent flow during the operation of the motor, the inner blades, which are provided inside the exhaust pipe to generate an intake-exhaust force during the operation of the motor, can be provided integrally with the inner circumferential surface of the rotor structure 110, on which the turbulence-generating outer blades are provided, or separately on the rotary shaft 112 of the motor 109.

Accordingly, when the intake-exhaust inner blades 150 are provided on the inner circumference of the rotor structure 110 at certain intervals or provided on the rotary shaft 112, they rotate together with the turbulence-generating outer blades 130 following the rotation of the rotor structure, thereby generating an intake-exhaust force that forces polluted air into the exhaust pipe 101 and then exhausts the polluted air.

A fixed end 152 of each intake-exhaust inner blade 150 can be fixed integrally or detachably to the inner circumference of the rotor structure 110, and a free end 154 of the intake-exhaust inner blade 150 extends a predetermined height from the fixed end 152, is bent substantially perpendicularly toward the intake port 102, and extends a predetermined length, such that a portion thereof is introduced into the intake port 102.

Here, each intake-exhaust inner blade 150 can be configured such that the blade body, extending from the fixed end 152 with respect to the air intake direction of, is inclined in one direction or spiraled.

In addition, it is preferred that an outer edge 153 of the intake-exhaust inner blade 150 between the fixed end and the free end thereof, corresponding to the center of rotation of the rotor structure 110, be curved in order to minimize friction resistance to the air, which includes pollutants, when the intake-exhaust inner blade 150 is rotated.

Inside the intake port 102, an outer edge 155 of the intake-exhaust inner blade 150, corresponding to the inner surface of the exhaust pipe 101, is spaced apart from the inner surface of the exhaust pipe at a predetermined interval such that it does not interfere with the exhaust pipe when the intake-exhaust inner blades 150 are rotated.

FIGS. 6 and 7 are configuration views showing a local exhaust system capable of controlling a turbulent flow according to a second exemplary embodiment of the invention. The local exhaust system 100 a has one or more intake-exhaust inner blades 150 a on intermediate portions of the length of the rotary shaft 112, instead of the intake-exhaust inner blades 150 provided in a rotor structure 110, such that a source of intake-exhaust force, which is generated when a motor is operating, is formed inside the exhaust pipe 101.

In this case, as shown in FIG. 6, the intake-exhaust inner blades 150 a can be provided as a plurality of blade members, which are connected to a support member 113 a extending from the rotary shaft 112 in the radial direction and are arranged at certain intervals on the inner circumference of an inner rotor structure 110 a, which is disposed inside the exhaust pipe, in the same fashion as in the rotor structure 110.

Each intake-exhaust inner blade 150 a includes a fixed end 152 a, a free end 154 a, and inner and outer edges 153 a and 155 a. The fixed end 152 a is integrally or detachably fixed to the inner circumference of the inner rotor structure 110 a. The free end 154 a has a shape that extends a certain height toward the center of rotation from the fixed end 152 a, is bent substantially perpendicularly into the exhaust pipe, and extends a certain length. The inner and outer edges 153 a and 153 b connect between the fixed end and the free end.

Although the turbulence-generating intake-exhaust inner blades 150 a have been described as having the same configuration as that of the blades of the rotor structure 110, which is provided on the leading end of the intake port, this is not intended to be limiting. Various types of intake blades, such as an impeller, a sirocco-fan, or a box-like fan, can also be provided as long as they can generate an intake-exhaust force inside the exhaust pipe when driven to rotate.

Accordingly, since the intake-exhaust inner blades 150 a inside the exhaust pipe 101 generate an intake-exhaust force inside the exhaust pipe when the motor is operating, it is possible to prevent the intake-exhaust force, which is generated from the intake-exhaust inner blades 150 arranged outside the exhaust pipe 101, from being dissipated to the outside, and thereby improve the operation efficiency and the intake-exhaust force of the local exhaust system.

In the local exhaust system 100 a, as shown in FIG. 6, turbulence-generating outer blades 130 can be provided on a rotor structure 110, which is rotated when the motor is operating. However, as shown in FIG. 7, a plurality of turbulence-generating outer blades 130 a can be fixed at one end thereof to the outer surface of the rotor structure 110, such that the angle thereof is not easily adjustable. The turbulence-generating outer blades 130 a are provided on the outer surface of the rotor structure 110 in the radial direction at regular intervals.

Although the intake-exhaust inner blades 150 a have been described as being provided on the rotary shaft, this is not intended to be limiting. Alternatively, the intake-exhaust inner blades 150 a can be provided on the inner circumference of the rotor structure 110, to which the turbulence-generating outer blades 130 a are fixed.

FIGS. 8 and 9 are configuration views showing a local exhaust system capable of controlling a turbulent flow according to a third exemplary embodiment of the invention. Here, the local exhaust system 100 b includes a plurality of turbulence-generating outer blades 130 b in place of a plurality of the turbulence-generating outer blades 130 shown in FIGS. 1, 6, and 7. As shown in FIGS. 1, 6, and 7, a plurality of the turbulence-generating outer blades 130 is provided on the outer surface of the rotor structure 110 such that the angle thereof is adjustable or not easily adjustable, and the rotor structure 110 is configured as a hollow cylindrical member, with the inner and outer surfaces thereof being oriented perpendicular to the intake direction. In contrast, in the local exhaust system 100 b, a plurality of turbulence-generating outer blades 130 b is provided on the lower surface of a rotor structure 110 b such that the angle thereof is adjustable or not easily adjustable, and the rotor structure 110 b is configured as a hollow disc member, with the upper and lower surfaces being oriented perpendicular to the intake direction.

As shown in FIG. 8, each turbulence-generating outer blade 130 b provided on the lower surface of the rotor structure 110 b can be assembled to the lower surface of the rotor structure 110 b such that the angle of the turbulence-generating outer blade 130 b can be adjusted via an angle-adjusting member 135. Similar to the first exemplary embodiment, the angle-adjusting member 135 can include an erected member 135 a, which is fitted into a coupling hole 135 b of a turbulence-generating outer blade 130 b, and a fixing member 135 c, which is fastened into a fastening hole in one end of the erected member 135 a and is closely fixed to the turbulence-generating outer blade 130 b.

In addition, as shown in FIG. 9, turbulence-generating outer blades 130 c can be fixed at the upper end thereof to the lower surface of the rotor structure 110 b, such that the angle thereof is not easily adjustable.

In the case where it is intended to exhaust polluted air by operating the local exhaust system 100, 100 a, 100 b, which has the above-described configuration, when the motor 109 installed inside the exhaust pipe 101 is supplied with an external voltage in the state where the rotor structure 110, 110 b having the turbulence-generating outer blades is installed in the intake port 102, which is the leading end of the exhaust pipe 101, the rotor structure 110, 110 b is rotated in one direction about the rotary shaft 112.

In subsequence, following the rotation of the rotor structure 110, 110 b in one direction, a plurality of the turbulence-generating outer blades 130, 130 b, which is provided on the outer or lower surface of the rotor structure 110, 110 b, is rotated in the same direction.

Specifically, the rotation of the turbulence-generating outer blades 130, 130 a, 130 b following the rotation of the rotor structure generates a turbulent flow in the form of a doughnut by pushing the air, which is directly below and around the exhaust pipe 101, outward in the radial direction of the rotor structure. At this time, the turbulent flow, which is forcibly formed by the turbulence-generating outer blades, acts as an air curtain that separates an area, in which pollutants are produced, from an area, in which the pollutants are not produced.

At the same time, when the motor is operated, the intake-exhaust inner blades 150, 150 a mounted on the inner surface or the rotary shaft 112 of the rotor structure 110 are driven to rotate in the same direction as that of the turbulence-generating outer blades, thereby generating an intake-exhaust force having a certain strength inside the rotor structure 110 arranged on the leading end of the intake port of the exhaust pipe 101 or inside the exhaust pipe 101 according to the position on which the intake-exhaust inner blades are installed

Accordingly, due to the intake-exhaust force forcibly formed by the intake-exhaust inner blades, the pollutants-containing air, which occurs in a pollutant source area, can be concentrically and forcibly taken in and exhausted to the outside through the exhaust pipe.

Here, the angle of the turbulence-generating outer blades 130, 130 b, which are assembled to the outer surface or the lower surface of the rotor structure, is adjusted with respect to the intake direction P of the air by the angle-adjusting member 135, so that the flow rate of a turbulent flow, which is formed by the turbulence-generating outer blades, can be adjusted. Thus, the size of the intake area formed in the lower area of the intake port can be suitably varied.

In addition, as shown in FIG. 4 (a), each turbulence-generating outer blade is rotated at a certain angle in the clockwise or counterclockwise direction about the erected member 135 a fitted into the coupling hole 135 b, which penetrates the central portion of the body of the turbulence-generating outer blade. Afterwards, the turbulence-generating outer blade, which is adjusted at a preset angle, is securely fixed in position by the fixing member 135 c, which is fastened into the fastening hole formed in one end of the erected member 135 a. The same operation of adjusting the angle is applied to all the turbulence-generating outer blades, which are provided on the outer surface of the rotor structure.

Alternatively, as shown in FIG. 4 (b), in the state where each coupling hole 135 b, which penetrates the central portion of the body of each turbulence-generating outer blade, is completely separated from the erected member 135 a, the turbulence-generating outer blade is rotated at a certain angle in the clockwise or counterclockwise direction. Afterwards, the coupling grooves 135 e formed in the inner surface of the couple hole 135 b and the ribs 135 d formed on the outer surface of the erected member 135 a are coupled with each other. At the same time, the turbulence-generating outer blade 130, which is adjusted at a preset angle, is securely fixed in position by the fixing member 135 c, which is fastened into the fastening hole formed in one end of the erected member 135 a.

Otherwise, as shown in FIG. 4 (c), a fitting recess, partially formed in the lower end portion of the coupling hole 135 b penetrating the central portion of the body of each turbulence-generating outer blade, is arranged on the circular cross-section portion of the erected member 135 a such that the fitting recess is temporarily separated from the ribs, and in this state, the outer blade 130 is rotated at a certain angle in the clockwise or counterclockwise direction. Afterwards, the outer blade and the erected member are assembled together so that the coupling grooves 135 e formed in the lower end of the inner surface of the coupling hole 135 b and the ribs 135 d formed on the lower end of the outer surface of the erected member 135 a are coupled in a corresponding fashion. At the same time, the turbulence-generating outer blade, which is adjusted at a preset angle, is securely fixed in position by the fixing member 135 c, which is fastened into the fastening hole formed in one end of the erected member 135 a.

When the turbulence-generating outer blades are forcibly rotated in the state where the turbulence-generating outer blades are fixedly mounted or finally adjusted to be inclined at a preset angle with respect to the intake direction P of the air as described above, it is possible to expand the position, in which a turbulent flow is generated, in the outward direction while more securely pushing the air, which comes into contact with the outer blades, in the outward direction. Thereby, it is possible to increase the intake area, in which the air including pollutants can be forcibly taken in, in order to exhaust the air including pollutants.

The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for the purposes of illustration and description. It will be apparent to a person of ordinary skill in the art that many modifications and variations are possible in light of the above teachings without departing from the principle or the scope of the invention defined by the Claims appended hereto and their equivalents. 

1. A local exhaust system comprising: a motor provided in an exhaust pipe to generate a rotary drive force when power is applied thereto, wherein air is taken in through an intake port and exhausted through the exhaust pipe; a rotor structure disposed on a leading end of the intake port and connected to a drive shaft of the motor, the rotor structure rotating about a central portion of the exhaust pipe; and a plurality of turbulence-generating outer blades for generating a turbulent flow when rotated, wherein each of the turbulence-generating outer blades is assembled to an outer surface of the rotor structure via an angle-adjusting member in such a fashion that an angle of the turbulence-generating outer blade is adjustable with respect to a direction in which air is taken in through the intake port.
 2. The local exhaust system according to claim 1, further comprising an intake-exhaust inner blade provided on the rotor structure to be located inside the rotor structure or on a rotary shaft in a central portion of the rotor structure to be located inside the exhaust pipe, wherein the intake-exhaust inner blade generates an intake-exhaust force inside the rotor structure or the exhaust pipe.
 3. The local exhaust system according to claim 2, wherein the rotor structure comprises a hollow cylindrical member, with inner and outer surfaces thereof being parallel with the direction in which air is taken in, and wherein the intake-exhaust inner blade has a fixed end fixed to an outer circumference of the rotor structure and a free end bent from the fixed end, the free end extending a predetermined length such that the free end is introduced into intake port.
 4. The local exhaust system according to claim 2, wherein the intake-exhaust inner blade has a fixed end fixed to an outer circumference of the rotor structure, which is arranged inside the exhaust pipe, and a free end bent from the fixed end and extending a predetermined length toward the exhaust pipe.
 5. The local exhaust system according to claim 1, wherein a plurality of the turbulence-generating outer blades is provided on an outer circumference of the rotor structure comprising a hollow cylindrical member, with inner and outer surfaces thereof being parallel with the direction in which air is taken in, or on a lower surface of the rotor structure comprising a hollow disc member, with lower and upper surfaces thereof being perpendicular to the direction in which air is taken in.
 6. The local exhaust system according to claim 1, wherein the angle-adjusting member includes an erected member extending perpendicularly from the outer surface of the rotor structure and fitted into a coupling hole, which penetrates a central portion of each body of the turbulence-generating outer blades, and a fixing member assembled to one end of the erected member to fix each of the turbulence-generating outer blades in position, with an angle of the each turbulence-generating outer blade adjusted about the erected member, the fixing member being closely fixed to the each turbulence-generating outer blade.
 7. The local exhaust system according to claim 6, wherein the erected member has a plurality of ribs, which protrude from an outer surface of a body of the erected member and extend in a lengthwise direction of the erected member, such that the ribs conform to and are coupled with a plurality of coupling grooves of the coupling hole, wherein the coupling grooves are recessed into an inner surface and extend in a lengthwise direction of the coupling hole.
 8. The local exhaust system according to claim 6, wherein the erected member has a plurality of ribs, which protrudes from an outer surface of a portion of a body of the erected member and extends in a lengthwise direction of the erected member, such that the ribs conform to and are coupled with a plurality of coupling grooves of the coupling hole, wherein the coupling grooves are formed in an outer end portion of the coupling hole, and an outer surface of a remaining portion of the body of the erected member has a circular cross section such that the remaining portion of the body of the erected member is insertable into an inner surface of an inner end portion of the coupling hole.
 9. A local exhaust system comprising: a motor provided in an exhaust pipe to generate a rotary drive force when power is applied thereto, wherein air is taken in through an intake port and exhausted through the exhaust pipe; a rotor structure disposed on a leading end of the intake port and connected to a drive shaft of the motor, the rotor structure rotating about a central portion of the exhaust pipe; a plurality of turbulence-generating outer blades provided on an outer surface of the rotor structure at predetermined intervals, wherein the turbulence-generating outer blades generate a turbulent flow in a lower portion of the rotor structure while being rotated in a predetermined direction under a driving force from the motor; and an intake-exhaust inner blade provided on a rotary shaft in a central portion of the rotor structure or inside the rotor structure, such that intake-exhaust inner blade generates an intake-exhaust force inside the exhaust pipe while being rotated in a predetermined direction under a driving force from the motor.
 10. The local exhaust system according to claim 9, wherein the rotor structure comprises a hollow cylindrical member, with inner and outer surfaces thereof being parallel with the direction in which air is taken in, and wherein the intake-exhaust inner blade has a fixed end fixed to an outer circumference of the rotor structure and a free end bent from the fixed end, the free end extending a predetermined length such that the free end is introduced into intake port.
 11. The local exhaust system according to claim 9, wherein the intake-exhaust inner blade has a fixed end fixed to an outer circumference of the rotor structure, which is arranged inside the exhaust pipe, and a free end bent from the fixed end and extending a predetermined length toward the exhaust pipe.
 12. The local exhaust system according to claim 9, wherein the turbulence-generating outer blades are assembled to an outer circumference of the rotor structure via an angle-adjusting member, such that an angle of each of the turbulence-generating outer blades is adjustable, or fixedly positioned on the outer circumference of the rotor structure, wherein the rotor structure comprises a hollow cylindrical member, with inner and outer surfaces thereof being parallel with the direction in which air is taken in.
 13. The local exhaust system according to claim 9, wherein the turbulence-generating outer blades are assembled to an outer circumference of the rotor structure via an angle-adjusting member, such that an angle of each of the turbulence-generating outer blades is adjustable, or fixedly positioned on the outer circumference of the rotor structure, wherein the rotor structure comprises a hollow disc member, with inner and outer surfaces thereof being perpendicular to the direction in which air is taken in.
 14. The local exhaust system according to claim 12 or 13, wherein the angle-adjusting member includes an erected member extending perpendicularly from the outer surface of the rotor structure and fitted into a coupling hole, which penetrates a central portion of each body of the turbulence-generating outer blades, and a fixing member assembled to one end of the erected member to fix each of the turbulence-generating outer blades in position, with an angle of the each turbulence-generating outer blade adjusted about the erected member, the fixing member closely fixed to the each turbulence-generating outer blade.
 15. The local exhaust system according to claim 14, wherein the erected member has a plurality of ribs, which protrudes from an outer surface of a body of the erected member and extends in a lengthwise direction of the erected member, such that the ribs conform to and are coupled with a plurality of coupling grooves of the coupling hole, and wherein the coupling grooves are recessed into an inner surface of the coupling hole and extend in a lengthwise direction of the coupling hole.
 16. The local exhaust system according to claim 14, wherein the erected member has a plurality of ribs, which protrudes from an outer surface of a portion of a body of the erected member and extends in a lengthwise direction of the erected member, such that the ribs conform to and are coupled with a plurality of coupling grooves of the coupling hole, wherein the coupling grooves are formed in an outer end portion of the coupling hole, and an outer surface of a remaining portion of the body of the erected member has a circular cross section such that the remaining portion of the body of the erected member is insertable into an inner surface of an inner end portion of the coupling hole. 